<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div class="headerdiv">
        <img src="../../../assets/logo2.png" />
        <span>菜谱后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'"><!--判断是否被折叠-->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="isCollapse"
          :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.navid + ''" v-for="item in menulist" :key="item.navid">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.navid]"></i>
              <!-- 文本 -->
              <span>{{item.navname}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.navurl" v-for="subItem in item.navs" :key="subItem.navid" @click="saveNavState('/' + subItem.navurl)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.navname}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        1: 'el-icon-reading',
        2: 'el-icon-document',
        3: 'el-icon-user-solid',
        5: 'el-icon-setting'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList() // 查询导航菜单
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出登陆按钮
    loginOut () {
      window.sessionStorage.clear()
      this.$router.push('/login') // 重定向到登陆页
    },
    // 获取所有的菜单导航
    async getMenuList () {
      const user = JSON.parse(sessionStorage.getItem('user'))
      const {
        data: res
      } = await this.$axios.get('OtherController/menuNav.action', {
        params: { // 参数 角色id
          uroleid: user.uroleid
        }
      })
      this.menulist = res
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }

  }
}
</script>

<style scoped>
  /*最外部*/
  home-container {
    height: 100%;
  }
/*头部*/
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
  }

  .headerdiv {
    display: flex;
    align-items: center;
  }

  .headerdiv span {
    margin-left: 15px;
  }

  .headerdiv img {
    width: 80px;
    height: 60px;
  }
/*左侧栏*/
  .el-aside {
    background-color: #333744;
  }

  .el-aside .el-menu {
    border-right: none;
  }
/*主体区*/
  .el-main {
    background-color: #eaedf1;
  }

  .iconfont {
    margin-right: 10px;
  }

  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
